CT imaging findings of corona mortis and a new method for venous typing

Area of Science:

• Anatomy
• Vascular Surgery
• Radiology

Background:

• The corona mortis (CMOR) is an important vascular structure near the acetabulum.
• Variations in CMOR, including arterial (ACMOR) and venous (VCMOR) types, can pose risks during pelvic surgery.
• A standardized classification for VCMOR is lacking, hindering surgical planning.

Purpose of the Study:

• To comprehensively analyze CT angiographic data of CMOR.
• To propose a novel classification system for VCMOR.
• To evaluate the incidence, characteristics, and anatomical variations of CMOR.

Main Methods:

• Retrospective analysis of 719 patients who underwent CT-enhanced abdominal or pelvic examinations.
• Evaluation of patient demographics, CMOR incidence, vessel diameter, location, and acetabular distance.
• Development and application of a new classification for VCMOR based on identified anatomical configurations.

Main Results:

• A high incidence of CMOR (73.44%) was observed, with bilateral occurrences being more common.
• ACMOR incidence was 23.92%, with four identified types and a mean distance of 56.6 mm from the pubic symphysis (greater in females).
• VCMOR incidence was 68.43%, showing significant diversity with fourteen anatomical configurations classified into two types and five subtypes.

Conclusions:

• CMOR, especially VCMOR, exhibits considerable variation in origin and branching, characterized by complexity.
• The proposed classification system for VCMOR aids in understanding its diverse anatomical configurations.
• Recognition of CMOR variations is essential for safe and effective pelvic surgery.